A representative from Meriter Hospital in Madison said an ambulance traveling to Appleton to pick up a baby went off the road in Fond du Lac County around 12:40 p.m.

A neonatal physician on board the ambulance suffered head injuries and was med-flighted to Theda Clark Medical Center in Neenah. A respiratory therapist on the ambulance was hurt and taken to a hospital in Waupun with minor injuries. A registered nurse was taken to a Fond du Lac hospital with minor injuries.

Another passenger and the ambulance driver were not injured. There were no patients aboard the ambulance at the time of the crash.

The cause of the crash is unknown, but Meriter said the ambulance driver should not have been speeding, since it was not an emergency call.

The highway was reopened around 1:45 p.m. but the ambulance remained where it was.

Some motorists told WISN 12 News reporter Mike Anderson it is one of the most dangerous curves in the state.

"It's a problem. It's kind of scary just to be on top of our driveway just to pull out," resident Shyann Hoekstra said.

Hoekstra and her family have been dealing with drivers flipping vehicles on their lawn -- like the ambulance -- for more than 20 years.

"Yeah, well, they hit the trees so it stops it, but if we didn't have the trees, they'd come right through," Hoekstra said.

Investigators said this crash is the fourth one this year coming out of the dangerous curve near Willow Creek and Highway 26.

"We dedicate an officer to this highway at least four hours a day, and it's usually driver error that is the problem. Everybody is just in a hurry," Fond du Lac County Sheriff's Office Sgt. John Toney said.

Stay with WISN.com and our Free mobile apps for updates on this situation.

DISPATCHERS. THIS AMBULANCE... DESIGNED TO TRANSPORT INFANTS, CRASHES AND ROLLS ONTO ITS SIDE IN WAUPUN. WE'VE LEARNED THE CREW ON-BOARD WAS ON ITS WAY TO PICK UP A PATIENT. 12 NEWS MIKE ANDERSON IS FOLLOWING THIS BREAKING NEWS IN WAUPUN. HE'S ALONG HIGHWAY 26 AND NEITMAN ROAD. MIKE, THE PEOPLE ON BOARD WERE HURT. THIS STEEP CURB ON HIGHWAY 26 NEAR WILLOW CREEK IS THIS STEEP CURB ON HIGHWAY 26 NEAR WILLOW CREEK IS WHAT WE'RE TALKING ABOUT HERE ON THE TOWN OF WAPUN. PEOPLE ARE HITTING IT TOO FAST AND VEHICLES ARE CRASHING ON A FAMILY'S FRONT YARD. SOT@4775@02:49:37:28 SHYANN HOEKSTRA, RESIDENT:"IT'S A PROBLEM, IT'S KIND OF SRY JUST TO BE ON TOP OF OUR DRIVE WAY JUST TO PULL OUT":05 SHYANN HOEKSTRA AND HER FAMILY HAVE BEEN DEALING WITH DRIVERS FLIPPING THEIR VEHICLES ON THEIR LAWN LIKE THIS AMBULANCE DID WEDNESDAY AFTERNOON FOR MORE THAN 20 YEARS. SOT@4775@02:49:17:00 SHYANN HOEKSTRA:"YEAH WELL THEY HIT THE TREES SO IT STOPS IT BUT IF WE DIDN'T HAVE THE TREES THEY'D COME RIGHT THROUGH":04 INVESTIGATORS SAY THIS MISHAP IS THE 4TH ONE THIS YEAR COMING OUT OF THE DANGEROUS CURVE NEAR WILLOW CREEK AND HIGHWAY 26TH. SOT@4771@02:45:46:12 SGT. JOHN TONEY, FON DU LAC CO. SHERIFF'S OFFICE:"WE DEDICATE AN OFFICER TO THIS HIGHWAY AT LEAST FOUR HOURS A DAY AND ITS USUALLY DRIVER ERROR THAT IS THE PROBLEM EVERYBODY IS JUST IN A HURRY":10 THERE WERE FIVE PEOPLE IN THE AMBULANCE. ONE WAS TAKEN TO THE HOSPITAL BY FLIGHT FOR LIFE. THE OTHER INJURIES WERE NON LIFE THREATENING. THE HOEKSTRA FAMILY SAYS THEY LIVE IN FEAR EVERYDAY. SOT@4775@02:50:17:12 SHYANN HOEKSTRA:" THEY GO ON THAT THING RIGHT THERE, YOU KNOW IT LOOKS LIKE THEY PASS BUT THAT'S FOR PEOPLE WHO TURN ONTO THAT ROAD AND THEY THINK IT GOES ALL THE WAY BUT IT ENDS RIGHT THERE AND THEY HIT OUR GRAVEL AND THEN HIT OUR DITCH AND THEY LOSE CONTROL":11 OUT"LOSE CONTROL" WE ASKED THE FAMILY ABOUT MOVING, THEY THEY'VE COME TO LIVE WITH IT. THE DEPUTY TELLS US IT'S UP TO THE STATE TO MAKE CHANGES, AND SO FAR IT HASN'T. LIVE IN THE TOWN OF WAPUN, MIKE ANDERSON WISN 12 NEWS. A SPOKESMAN FROM MERITER HOSPITAL SAYS STAFFERS THERE ARE ALSO TRYING TO LEARN MORE ABOUT THE CRASH. PARTICULARLY THE DOCTOR...WHO THEY'VE BEEN TOLD HAS SOME TYPE OF HEAD INJURY. IT'S VERY STRESSFUL, WE DON'T EVEN KNOW THE NATURE OF THE INJURIES AT THIS POINT, ALL WE KNOW IS THAT HE WAS MED- FLIGHTED. WE DON'T HAVE EVEN UPDATES ON THE NATURE OF THE INJURY OR EVEN HOW SERIOUS IT WAS, IT WAS OBVIOUSLY SERIOUS ENOUGH TO BE MED-FLIGHTED THE HOSPITAL RELEASED NO INFORMATION ON THE IDENTITIES OF THE AMBULANCE CREW.